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Diffstat (limited to 'pkg/v1/empty/image.go')
-rw-r--r-- | pkg/v1/empty/image.go | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/pkg/v1/empty/image.go b/pkg/v1/empty/image.go new file mode 100644 index 0000000..c58a06c --- /dev/null +++ b/pkg/v1/empty/image.go @@ -0,0 +1,52 @@ +// Copyright 2018 Google LLC All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package empty + +import ( + "fmt" + + v1 "github.com/google/go-containerregistry/pkg/v1" + "github.com/google/go-containerregistry/pkg/v1/partial" + "github.com/google/go-containerregistry/pkg/v1/types" +) + +// Image is a singleton empty image, think: FROM scratch. +var Image, _ = partial.UncompressedToImage(emptyImage{}) + +type emptyImage struct{} + +// MediaType implements partial.UncompressedImageCore. +func (i emptyImage) MediaType() (types.MediaType, error) { + return types.DockerManifestSchema2, nil +} + +// RawConfigFile implements partial.UncompressedImageCore. +func (i emptyImage) RawConfigFile() ([]byte, error) { + return partial.RawConfigFile(i) +} + +// ConfigFile implements v1.Image. +func (i emptyImage) ConfigFile() (*v1.ConfigFile, error) { + return &v1.ConfigFile{ + RootFS: v1.RootFS{ + // Some clients check this. + Type: "layers", + }, + }, nil +} + +func (i emptyImage) LayerByDiffID(h v1.Hash) (partial.UncompressedLayer, error) { + return nil, fmt.Errorf("LayerByDiffID(%s): empty image", h) +} |